Indefinite Integral Lesson:
http://www.zweigmedia.com/RealWorld/tutorials4/frames6_1.html
Riemann Sums Applet:
http://www.calculusapplets.com/midpointtrap.html
http://archives.math.utk.edu/visual.calculus/4/riemann_sums.4/
Riemann Sums Approximation:
http://www.ies.co.jp/math/java/calc/kubunqX2jo/kubunqX2jo.html
Volume of a Solid of Revolution:
http://www.ies.co.jp/math/java/calc/rotate/rotate.html
http://www.calculusapplets.com/revolution.html
Volume of a Solid by Slicing (Triangles):
http://www.ies.co.jp/math/java/calc/rhansan/rhansan.html
Volume of a Solid by Slicing (Squares):
http://www.ies.co.jp/math/java/calc/renshi/renshi.html
http://www.calculusapplets.com/knowncrosssection.html
Slope Fields:
http://www.ies.co.jp/math/java/calc/DiffEqu/DiffEqu.html
http://www.calculusapplets.com/slopefields.html